[cisco-voip] Echo Cancellation and 7911 Phone Loads

[Jason Aarons (US)]

The only echo I've ever fixed was by changing load on the device....despite chasing my tail on everything else...then trying a new load

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Wes Sisk
Sent: Tuesday, August 31, 2010 3:00 PM
To: Jeff Ruttman
Cc: Cisco VOIP
Subject: Re: [cisco-voip] Echo Cancellation and 7911 Phone Loads

Talker echo is usually caused by echo at far end tail circuit.  With VOIP that delay is going to be too long for the talker's phone to cancel.  It will have to canceled closer to the source of the echo.

Otherwise, AFAIK, all cisco phones (except soft) have local ecan to prevent speaker audio from going back into mic.


http://www.voiptroubleshooter.com/problems/echo.html
http://www.cisco.com/en/US/partner/docs/ios/solutions_docs/voip_solutions/EA_ISD.html
http://www.cisco.com/en/US/partner/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml

/Wes

Jeff Ruttman wrote:
Greetings,

Can someone confirm or deny my memory?  I recall reading that phone loads for 7911 phones don't really contain echo cancellation programming.  In looking now, I can't find much info on echo cancellation in relation to different phone models/loads in general and nothing on 7911s.

We have an office mostly full of 7911s recently complaining of talker echo.  There are loads out on cisco.com newer than the ones we're using, and while it's not hard to change phone loads, it would be pointless to do it if the phone loads don't contain echo cancellation.

Any insight?

Thanks
jeff



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